didymosphenia

Didymosphenia is a genus of single-celled algae, specifically diatoms, belonging to the class Bacillariophyceae. These microscopic organisms are characterized by their silica cell walls, known as frustules, which are intricately patterned and often ornamented. The genus name itself, derived from Greek words meaning "twin" and "wedge," refers to the characteristic shape of the frustules. Didymosphenia species are commonly found in freshwater environments, often attached to submerged substrates like rocks, aquatic plants, and other algae. They reproduce both asexually through cell division and sexually. A notable species within this genus is Didymosphenia geminata, which has gained attention due to its ability to form dense blooms, sometimes referred to as "didymo" or "rock snot." These blooms can alter the physical habitat of rivers and streams, impacting invertebrate communities and recreational activities. The proliferation of D. geminata has been observed in various parts of the world, and research continues to investigate the factors contributing to its rapid growth and ecological effects.